Ordered to defect fluorite structural transition in Ce 1-x Nd x O 2-d system and its influence on ionic conductivity

被引：9

作者：

Aarthi, U. ^{[1
]}

Shukla, Dhananjaya ^{[1
]}

Rengaraj, S. ^{[1
]}

Babu, K. Suresh ^{[1
]}

机构：

[1] Pondicherry Univ, Ctr Nanosci & Technol, Madanjeet Sch Green Energy Technol, Pondicherry 605014, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 838卷

关键词：

CO-DOPED CERIA; ELECTRICAL-PROPERTIES; THERMAL-EXPANSION; SOLID-SOLUTIONS; PHASE-RELATIONS; GD; SM; RAMAN; ELECTROLYTES; PYROCHLORES;

D O I：

10.1016/j.jallcom.2020.155534

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structural transformation from fluorite – defect fluorite – hexagonal phase on the heavily doped ceria system (Ce1-xNdxO2-δ X = 0, 25, 50, 75 and 100 mol%) has been investigated in this study. The oxygen ionic conductivity increased with dopant content till 50 mol% due to the formation of rare earth C-type superstructure defect fluorite. The co-formation of rare earth C-type structure along with the fluorite increase the anion vacancies and facilitates the barrier free ion migration. The long-range ordering and the existence of mixed phases in the heavily doped (75 mol%) system lowered the oxide ion conductivity. Ce0.5Nd0.5O1.75 in disordered fluorite structure exhibits a superior ionic conductivity of 6.0 mS/cm with an activation energy of 0.93 eV which has a potential as electrolyte in solid oxide fuel cells application. © 2020 Elsevier B.V.

引用

页数：10

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